Democratic Reps. Raul Grijalva (Ariz.) and Donald McEachin (Va.) are turning to the public to craft their next bill to protect low-income and minority communities from pollution.

The lawmakers will soon launch an interactive online tool that allows people to comment on eight “principles" on environmental justice. The comments will serve as a basis for future legislation from the lawmakers, who unveiled the effort at a June 26 summit on the issue.

The lawmakers sought the approach to make writing the legislation more participatory and inclusive from its inception, said Grijalva, who chairs the House...